[Bug] XamlC error XFC0000 : Cannot resolve type "Popup"

[fredericoregateiro]

Description

When using a Popup the project build is ok, it can be deployed to an emulator or device but the Error List shows this error

Steps to Reproduce

1. Create a Popup
2. Build the project

Expected Behavior

Build with no errors and the error list empty

Actual Behavior

Error in the Error List
XamlC error XFC0000 : Cannot resolve type "Popup"

Basic Information

• Version with issue:
• Last known good version:
• IDE: VS 2019 16.10.1
• Platform Target Frameworks:
  • iOS: not tested
  • Android: 11
  • UWP: not tested
• Android Support Library Version:
• Nuget Packages: Xamarin.CommunityToolkit 1.1.0 and 1.2.0 preview 2
• Affected Devices:

Workaround

Reproduction imagery

Reproduction Link

[jfversluis]

Similar to #1311 and #1384

[AmrAlSayed0]

@jfversluis Also here rotorgames/Rg.Plugins.Popup#619
Apparently, It has to do with URL names spaces. Using the fully qualified Namespace will solve the issue but it doesn't explain why it is happening though

[jfversluis]

Yeah I think it's more of a tooling issue than something we can fix unfortunately

[fredericoregateiro]

I try using the full namespace
xmlns:xctViews="clr-namespace:Xamarin.CommunityToolkit.UI.Views;assembly=Xamarin.CommunityToolkit"

and the errors are gone

[semihbilis]

I deleted this from namespace on xaml side
xmlns:popups="clr-namespace:{FilePath}" x:DataType="popups:{FileName}"
and solved, but i don't understand how it got there, you may not have